I have an 2008 xB Automatic with 89k miles. Car has always been running great. I had a bad battery and replaced it. Ever since then the car has low idle. The car runs great once you give it throttle but at idle its too slow so it is rough. Any ideas??

 

Disconnecting the battery resets the ECU. It should go back to normal after a few days/trips.

 

start your xb then let it idle for a few min and it should be good to go again

 

after changing battery,the computer resets itself,let it idle for 10 mins or so,disconnect it again,

 

its relearning itself. ECU was reset. Just drive it. kick on the AC too.